Django can not see any of the installed apps - django

Question

After a minor migration I keep receiving the following error from Django's runserver command:
RuntimeError: Model class captcha.models.CaptchaStore doesn't declare an explicit app_label and isn't in an application in INSTALLED
_APPS.
This is caused by django-simple-captcha
which has been working for quite a while (a month). I haven't changed something in this exact app.
I have uninstalled it and now Django can't find ADMIN app, so that it has something to do with integrity.
My settings are like this:
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
# custom
"boats.apps.BoatsConfig",
"articles.apps.ArticlesConfig",
#3rd party
"captcha",
"bootstrap4",
"django_cleanup",
"easy_thumbnails",
"social_django",
"crispy_forms",
"extra_views",
"debug_toolbar",
"reversion",
"dynamic_validator",
"django.forms", # new for a custom widgets
How I can fix this problem? It seems weird… Or alternativelly how to roll back the last migration?
full trace-back is below:
(myproject) C:\Users\hardcase1\PycharmProjects\myproject>python manage.py runserver
Watching for file changes with StatReloader
Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\python\Lib\threading.py", line 917, in _bootstrap_inner
self.run()
File "C:\python\Lib\threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\commands\runserver.py", line 109
, in inner_run
autoreload.raise_last_exception()
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\utils\autoreload.py", line 77, in raise_last_exc
eption
raise _exception[0](_exception[1]).with_traceback(_exception[2])
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\utils\autoreload.py", line 54, in wrapper
fn(*args, **kwargs)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\apps\registry.py", line 114, in populate
app_config.import_models()
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\apps\config.py", line 211, in import_models
self.models_module = import_module(models_module_name)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\hardcase1\PycharmProjects\myproject\boats\models.py", line 9, in <module>
from articles.models import SubHeading
File "C:\Users\hardcase1\PycharmProjects\myproject\articles\models.py", line 4, in <module>
from boats.models import ExtraUser
ImportError: cannot import name 'ExtraUser' from 'boats.models' (C:\Users\hardcase1\PycharmProjects\myproject\boats\models.py)
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\__init__.py", line 381, in execu
te_from_command_line
utility.execute()
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\__init__.py", line 375, in execu
te
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\base.py", line 323, in run_from_
argv
self.execute(*args, **cmd_options)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\commands\runserver.py", line 60,
in execute
super().execute(*args, **options)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\commands\runserver.py", line 95,
in handle
self.run(**options)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\core\management\commands\runserver.py", line 102
, in run
autoreload.run_with_reloader(self.inner_run, **options)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\utils\autoreload.py", line 579, in run_with_relo
ader
start_django(reloader, main_func, *args, **kwargs)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\utils\autoreload.py", line 564, in start_django
reloader.run(django_main_thread)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\utils\autoreload.py", line 272, in run
get_resolver().urlconf_module
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\utils\functional.py", line 80, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\urls\resolvers.py", line 564, in urlconf_module
return import_module(self.urlconf_name)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\hardcase1\PycharmProjects\myproject\myproject\urls.py", line 14, in <module>
path("captcha/", include("captcha.urls")),
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\urls\conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\importlib\__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\captcha\urls.py", line 2, in <module>
from captcha import views
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\captcha\views.py", line 3, in <module>
from captcha.models import CaptchaStore
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\captcha\models.py", line 25, in <module>
class CaptchaStore(models.Model):
File "C:\Users\hardcase1\.virtualenvs\myproject-N1oU6R8w\lib\site-packages\django\db\models\base.py", line 111, in __new__
"INSTALLED_APPS." % (module, name)
RuntimeError: Model class captcha.models.CaptchaStore doesn't declare an explicit app_label and isn't in an application in INSTALLED
_APPS.
Final migration
class Migration(migrations.Migration):
dependencies = [
('boats', '0014_auto_20190419_1429'),
]
operations = [
migrations.AlterField(
model_name='boatimage',
name='boat_photo',
field=models.ImageField(blank=True, upload_to=boats.utilities.get_timestamp_path, verbose_name='Boat photo'),
), # i removed help_text here
migrations.AlterField(
model_name='boatmodel',
name='boat_mast_type',
field=models.CharField(choices=[(None, 'Please choose rigging type'), ('SL', 'Sloop'), ('KE', 'Ketch'), ('YA', 'Yawl'), ('CK', 'Cat Ketch')], help_text='Please input boat rigging type', max_length=10, verbose_name='Boat rigging type'), # i added (None, 'Please choose rigging type') here
),
]

Answer 1

I presume you just uninstalled django-simple-captcha? Remove "captcha" from INSTALLED_APPS as well, or Django will still look for the app.
And of course delete all CaptchaFields from your models.

Answer 2

It was a circular import. Solution has been found, thanks to Alasdair.
I hid 2 imports inside the method...
def save(self, force_insert=False, force_update=False, using=None,
update_fields=None):
from articles.models import SubHeading, UpperHeading
SubHeading.objects.update_or_create(name=self.boat_name, order=0,
foreignkey_id=93)
models.Model.save(self, force_insert=False, force_update=False, using=None,
update_fields=None)